Tourtiere

Name: Tourtiere
Ingredients: 11/2 tbsp vegetable oil; 175g pork mince; 175g lean beef mince; 200g veal mince; 1 onion, finely chopped; 1 large carrot, grated; 1 celery stick, finely chopped; 1 large garlic clove, crushed; 175ml red wine; 1 tsp ground cloves; 1/2 tsp ground mace; 1/2 tsp ground nutmeg; 3 thyme sprigs; 1 bay leaf; 175ml beef stock; 35g rolled oats; 320g pack ready-rolled shortcrust pastry; 1 egg, lightly beaten; 320g pack puff pastry sheets